test(Dashboard): add input validation check for uuid group and leading slash
test(Dashboard): add input validation check for uuid group and leading slash

Throw an error if try to call these methods with a service not under
TEST_UUID group, or without leading slash in service id.

Closes DCOS-17383.

dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui